Choose from the following Apple iBook G4 (1.67MHz 12-inch) compatible memory modules listed below. Adding memory to your Apple iBook is the quickest and easiest upgrade you can make that will result in faster system performance. Our technical support team is available if you have any problems installing your new Apple iBook G4 (1.67MHz 12-inch) memory. Computer Memory Outlet quality tests all of our memory and back each module with a lifetime warranty so you can rest assured you are purchasing top quality products.